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IEEE Annual Computing and Communication Workshop and Conference (CCWC)

Secrecy Enhancement of a Cognitive Two-Way Relay Network with Coordinate Interleaving

Muhammad Ajmal Khan

Published Jan 27, 2021• 0 citations
Publisher

Abstract

This paper studies the physical-layer security of a cognitive two-way relay network under a spectrum sharing approach, where two users communicate with each other directly and via a decode-and-forward intermediate relay in the presence of a passive eavesdropper using the spectrum of the primary user. The paper proposes to incorporate coordinate interleaving into the cognitive two-way relay network to enhance its secrecy performance. The coordinate interleaver is applied at both sources and the relay to rotate and interleave the signal points before the transmission which enables to forward each component of the signal over an independent fading channel. The proposed scheme increases the spectral efficiency that is, it transmits more symbols in given time slots, thus increasing the secrecy capacity of the proposed scheme compared to the conventional system. Therefore, the secrecy performance analysis of the proposed scheme is completely different than that of the conventional system. The paper investigates the probability of secrecy outage, probability of intercept, and the probability of non-zero capacity for the proposed scheme. In addition, the paper also compares the secrecy performance of the proposed scheme with the conventional system. Finally, the paper confirms that the proposed scheme outperforms the conventional system.

DOI
10.1109/ccwc51732.2021.9375910

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This paper investigates the physical layer security of a two-way cooperative relay system, where two sources communicate with each other directly as well as via an intermediate decode-and-forward (DF) relay. This paper proposes to incorporate modulation diversity into the two-way cooperative relay system to improve its secrecy performance. In this paper, the physical layer security of the two-way cooperative relay system with modulation diversity is explored in detail over Rayleigh fading channels using mathematical analysis and computer simulations. When the modulation diversity is integrated into two sources and the intermediate DF relay, both source and relay cooperatively transmit different symbols, thus increasing the spectral efficiency of the system by exchanging four symbols in three time slots compared to the conventional two-way cooperative relay system which exchanges two symbols in three time slots. Hence, the mutual information of the proposed system is higher than the conventional system that makes the analysis of the proposed system is entirely different than the conventional system. This paper presents the mathematical analysis for the secrecy outage probability, the probability of non-zero secrecy capacity, and the intercept probability of the proposed system. Moreover, it carries out comprehensive computer simulations to validate the mathematical framework. Finally, the results confirm the significant improvement of the two-way cooperative relay system's secrecy performance by incorporating the proposed scheme compared to the conventional system.
In this study, the physical layer security for cognitive radio network (CRN) will be investigated in which a secondary user transmitter (SU-Tx) sends confidential information to a SU receiver (SU-Rx) on the same frequency band of a primary user (PU) in the presence of an eavesdropper receiver. Moreover, relay selection scheme is proposed for the security constrained CRNs with single eavesdropper, multiple eavesdroppers and PUs. The proposed scheme selects a trusted decode and forward relay to assist the SU-Tx and maximise the achievable secrecy rate that is subjected to the interference power constraints at the PUs for the different number of eavesdroppers and PUs under available channel knowledge. The SU cooperates with relays only when a high secrecy rate is achieved. Secrecy rate and secrecy outage probability are the two performance metrics that are used to verify the effectiveness of the proposed scheme although asymptotic approximations of the secrecy outage probability are also derived. Simulation and analytical results demonstrate that the performance improvement of the proposed scheme reaches to the double relative to the conventional scheme for the secrecy capacity.
We present secrecy performance of a two-way communication (TWC) with a number of amplify and forward (AF) relays in a cognitive radio network (CRN) as well as TWC with the help of DF relays. A TWC with multiple untrusted half-duplex AF relays is set up in an underlay CRN where two sources are not directly connected due to shadowing and path loss. In this cognitive network, two sources share their information to each other over two phases via an intermediate relay selected among multiple AF relays. A power-splitting scheme based energy harvesting from radio frequency signal is considered at the relay. Further, the AF relays are untrusted and eavesdrops the message also. Due to the CRN, the transmit power of the transmitting nodes are controlled under the cognitive constraints such as outage probability threshold of the primary network. Further, the TWC is analyzed with DF relays where an external eavesdropper eavesdrops the message from both the sources but not simultaneously. We have evaluated the physical layer security (PLS) through a metric known as secrecy outage probability (SOP). We have derived SOP in closed-form expression and presented in for both the scenarios of investigations. The analytical results, based on the closed-form expression, are justified by the MATLAB-based simulation results. We observe that PLS increases with an increase in the number of relays, primary network transmit power, and transmit power of the cognitive device. In TWC with DF relays, an optimal value of transmit power of a source and fraction of supply power to the relay are obtained at which secrecy performance is maximized.
Wireless communication systems are vulnerable to eavesdropping attack in which the attacker overhear the transmitted data in the network. Hence, the physical-layer security is of utmost importance to protect the wireless communications against the eavesdropping attack. In this paper, we study the physical-layer security of a two-hops cognitive radio-based communication system where the secondary user sends some confidential information to a destination through a relay. This relay is assumed to be equipped with multiple antennas for reception, applies the maximum-ratio combining technique for the received signals, and uses only one antenna to forward the combined signal to the destination. The transmission is performed under the eavesdropper's attempt to listen to the communication channel. The secrecy outage probability and the intercept probability are both derived based on the statistical characteristics of the channels and under the constraint of avoiding the communication outage of the primary user. All results have been validated using Monte Carlo method.
This study proposes the approach of using signal space diversity (SSD) to enhance physical layer security (PLS) for cooperative two-way networks with many decode-and-forward (DF) relays. We evaluate a range of secrecy performance metrics to establish the advantages of the proposed approach against conventional architectures. By rotating and interleaving symbols prior to transmission, SSD increases mutual information and secrecy capacity, distinguishing the analysis approach from that of traditional networks. To further boost security, a best relay selection algorithm is implemented, identifying the optimal relay in data exchange between sources. Numerical findings proves the dramatic improvement in secrecy performance of the proposed network. Moreover, the non-zero secrecy capacity probability achieves a2 dB\mathbf{2} \mathbf{~ d B}2 dBgain, and the probability of intercept performance improves by 600 times with multiple relays, strengthening the PLS for the proposed network. These results underscore the capabilities of the proposed network to reinforce security in nextgeneration networks.
Motivated by recent developments in wireless communication, this thesis aims to characterize the secrecy performance in several types of typical wireless networks. Advanced techniques are designed and evaluated to enhance physical layer security in these networks with realistic assumptions, such as signal propagation loss, random node distribution and non-instantaneous channel state information (CSI). The first part of the thesis investigates secret communication through relay-assisted cognitive interference channel. The primary and secondary base stations (PBS and SBS) communicate with the primary and secondary receivers (PR and SR) respectively in the presence of multiple eavesdroppers. The SBS is allowed to transmit simultaneously with the PBS over the same spectrum instead of waiting for an idle channel. To improve security, cognitive relays transmit cooperative jamming (CJ) signals to create additional interferences in the direction of the eavesdroppers. Two CJ schemes are proposed to improve the secrecy rate of cognitive interference channels depending on the structure of cooperative relays. In the scheme where the multiple-antenna relay transmits weighted jamming signals, the combined approach of CJ and beamforming is investigated. In the scheme with multiple relays transmitting weighted jamming signals, the combined approach of CJ and relay selection is analyzed. Numerical results show that both these two schemes are effective in improving physical layer security of cognitive interference channel. In the second part, the focus is shifted to physical layer security in a random wireless network where both legitimate and eavesdropping nodes are randomly distributed. Three scenarios are analyzed to investigate the impact of various factors on security. In scenario one, the basic scheme is studied without a protected zone and interference. The probability distribution function (PDF) of channel gain with both fading and path loss has been derived and further applied to derive secrecy connectivity and ergodic secrecy capacity. In the second scenario, we studied using a protected zone surrounding the source node to enhance security where interference is absent. Both the cases that eavesdroppers are aware and unaware of the protected zone boundary are investigated. Based on the above scenarios, further deployment of the protected zones at legitimate receivers is designed to convert detrimental interference into a beneficial factor. Numerical results are investigated to check the reliability of the PDF for reciprocal of channel gain and to analyze the impact of protected zones on secrecy performance. In the third part, physical layer security in the downlink transmission of cellular network is studied. To model the repulsive property of the cellular network planning, we assume that the base stations (BSs) follow the Mat´ern hard-core point process (HCPP), while the eavesdroppers are deployed as an independent Poisson point process (PPP). The distribution function of the distances from a typical point to the nodes of the HCPP is derived. The noise-limited and interference-limited cellular networks are investigated by applying the fractional frequency reuse (FFR) in the system. For the noise-limited network, we derive the secrecy outage probability with two different strategies, i.e. the best BS serve and the nearest BS serve, by analyzing the statistics of channel gains. For the interference-limited network with the nearest BS serve, two transmission schemes are analyzed, i.e., transmission with and without the FFR. Numerical results reveal that both the schemes of transmitting with the best BS and the application of the FFR are beneficial for physical layer security in the downlink cellular networks, while the improvement due